At the same time, Trump has expressed repeated concerns over the new law, especially challenging it as contradicting the principles of the US Constitution.

On Wednesday, the White House also issued a statement in which the president described the newly signed law as "seriously flawed" since "it encroaches on the executive branch’s authority to negotiate."

Commenting on the statement, Rep. Senator John McCain said that Trump’s concerns were "misplaced."

"The concerns expressed in the president’s signing statement are hardly surprising, though misplaced," McCain said Wednesday.

'Hostage of Congressional Opinion'

A day after he signed the law, Trump said that relations between Washington and Moscow are at "an all-time and very dangerous low" and cast the blame on Congress.

"Our relationship with Russia is at an all-time & very dangerous low. You can thank Congress, the same people that can't even give us HCare!" Trump said in a Twitter statement on Thursday.

Meanwhile, some experts pointed out that Trump is getting increasingly dependent on the establishment and Congress limits his actions.

According to Russian Senator Alexei Pushkov, having signed the new anti-Russian sanctions, Trump has become a hostage of congressional opinion.

"The US ruling elite demonstrates that they will not let him [Trump] carry out the policy towards Russia he initially planned. This is weakening Trump’s power and his ability to make decisions," Pushkov told journalists.

According to him, currently Congress plays the leading role in making decisions on US-Russia relations. The new sanctions law delivered a heavy blow to bilateral ties, especially amid the ongoing scandal over diplomatic property. The lawmaker added that Syria remains the only matter on which Moscow and Washington can continue to cooperate.

Meanwhile, Vladimir Bruter, a political analyst with the International Institute for Humanities and Political Studies, pointed out that a standoff between the president and Congress is typical for American politics.

"I can’t see any insurmountable tensions between Trump and Congress. This standoff is not serious, it is rather about rhetoric," Bruter told RT.

According to the analyst, Trump is not giving in to congressional pressure and will continue to defend his positions at any expense.

"I guess that Trump will fight. There is no coincidence that he has paid so much attention to sanctions. He will try to convince lawmakers that they interfere with his policy. The US would win if the president’s hands were untied," Bruter suggested.

He added that despite the persisting differences between the White House and Congress, Trump continues to remain the "main negotiator" on the issues concerning US-Russia ties. Moscow will continue a dialogue with Washington, taking into account the tensions between Trump and Congress.

"It is necessary to talk to Trump and [US State Secretary Rex] Tillerson. Moscow cannot ignore such an opportunity. The question is whether these negotiations will be productive or not," Bruter said.

Maksim Suchkov, an expert in American politics and analyst at the Russian International Affairs Council think tank, also underscored that a face-off between the US president and Congress is a common thing in the American political tradition.

He said that usually there is such a standoff if the president and Congress rival political forces. But the current "Republican-dominated Congress is trying to bind the hands and feet of the Republican president."

According to Suchkov, if Congress stays too focused on internal political struggles this will reduce the Republican Party’s chances for the 2018 election.

"As a result, the Democrats would have the chance to win a majority. If real, such a scenario may pave the way for Trump’s impeachment," the expert suggested.

According to Suchkov, by signing the new sanctions law Trump made a serious mistake. "He put himself at risk. I mean he set a certain precedent [that Congress may try to use against the president]."

At the same time, the analyst said that Trump has already blamed the decision on Congress, in an attempt to avoid responsibility. Suchkov suggested that Trump and his administration would continue to use this argument at their talks with Moscow.

Commenting on the prospects on US-Russia talks, the expert underscored that expectations should be "sober and cautious."

"The fact that the US continue to cooperate with Russia on Syria is positive. But Moscow should not expect major joint projects and any serious deals with Washington," Suchkov concluded.

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